Mutualised architecture for the control of electromechanical actuators

Abstract

In an electromechanical actuation chain for controlling the movement of moving loads (22) of an aeronautical turbomachine from a control unit (24), one or more of these moving loads being actuated by an electromechanical actuator (30), provision is made, in order to control this movement, for a single deterministic-control-based Ethernet controller (32) that uses an Ethernet bus (36) to control a set of converters (36) acting selectively on the electromechanical actuators.

Description

Technical Field

[0001] The present invention relates to the general field of the electrification of aeronautical turbomachines. Prior art

[0002] EP 2 942 679 A2 discloses a system for controlling and operating a parallel motor controller architecture. DE 10 2011 082965 A1 discloses a technique for operating a communication network in a motor vehicle to form a vehicle control system.

[0003] In this context, moving parts or loads such as variable geometries of the turbomachine, which include in particular the variable bleed valves or VBV (for Variable Bleed Valve) or pumps, can be controlled via an electromechanical type actuation chain to replace the current hydraulic control system comprising a mechanical synchronization consisting, as is known, of a ring and a set of rods and levers (also called bell cranks). The principle of this actuation chain consists of using an electromechanical actuator for each moving load or for a reduced number of moving loads. This type of architecture is called distributed type.

[0004] This distributed architecture, illustrated in figure 2 , is composed of an electromechanical actuation chain 20 ensuring the control of the position, in open or closed loop depending on the type of control desired, of mobile loads 22 via the electromechanical actuators 30 from a control unit of the turbomachine 24, for example an EEC (for Electronic Engine Controller). This architecture is made possible by the use of power electronics (controller 26 and converter 28). However, this electromechanical actuation chain requires having a converter 26 and a controller 28 opposite each actuator 30.

[0005] However, controlling mobile loads, such as VBV gates, requires multiplying the number of actuators involved, since one actuator is allocated to each VBV gate or to a reduced number of VBV gates, for example two to four gates. This therefore leads to the multiplication of power electronics with the consequence, given the criticality of the actuated systems, a lack of reliability and robustness with respect to the environment leading to systematic redundancy of the controllers in this distributed architecture.

[0006] However, in the aeronautical field, this systematic redundancy of controllers makes the integration of power electronics impossible due to the considerable increase in the mass / volume balance. Statement of the invention

[0007] The main aim of the present invention is therefore to overcome such a drawback by proposing a new architecture for controlling mobile loads making it possible to optimize the overall mass / volume balance of the electromechanical actuation chain while guaranteeing acceptable availability of the aeronautical turbomachine.

[0008] This aim is achieved by an electromechanical actuation chain for controlling the movement of mobile loads of an aeronautical turbomachine from a control unit, one or more of said mobile loads being actuated by an electromechanical actuator, characterized in that, to control said movement, it further comprises a single Ethernet controller with deterministic control ensuring via an Ethernet bus the control of a set of converters acting selectively on said electromechanical actuators, the speed of transfer of information that the Ethernet protocol allows being sufficiently fast to be considered instantaneous with respect to the movement of the mobile load.

[0009] Thus, by significantly reducing the number of controllers in the electromechanical actuation chain and by introducing an ultra-fast communication protocol, the redundancy of state-of-the-art controllers is avoided. Preferably, said electromechanical actuator is a permanent magnet synchronous motor, an asynchronous motor, a stepper motor or a variable reluctance motor, coupled or not to a linear or rotary mechanical transmission. Advantageously, said converter is a chopper or an inverter.

[0010] Preferably, said Ethernet controller is configured to manage as many current, speed and position loops as there are electromechanical actuators. Advantageously, the speed of transfer of information at the level of the current and speed loops, respectively the current and position loops, is at least one hundred times greater than that of the position loop, respectively the speed loop, controlling the movement of the mobile load.

[0011] Preferably, the speed of transfer of information at the level of the current loops corresponds to a transfer time of less than 15 microseconds, typically 10 microseconds.

[0012] Advantageously, the speed of transfer of information at the loop level, position or speed, controlling the movement of the mobile load corresponds to a transfer time of the order of 15 milliseconds.

[0013] Depending on the embodiment envisaged, said moving loads may be variable discharge valves whose movement is controlled by a position loop, pumps whose movement is controlled by a speed loop or any other similar member whose movement is controlled by a position or speed loop.

[0014] The present invention also relates to an aeronautical turbomachine comprising an electromechanical actuation chain for controlling the movement of mobile loads as mentioned above. Brief description of the drawings

[0015] Other characteristics and advantages of the present invention will emerge from the description given below, with reference to the appended drawings which illustrate an exemplary embodiment thereof without any limiting character and in which: [ Fig. 1] figure 1 illustrates a schematic diagram of a new power electronics architecture of an electromechanical actuation chain of mobile loads according to the invention, and [ Fig. 2 ] there figure 2 shows a schematic diagram of a conventional power electronics architecture of an electromechanical actuation chain of moving loads. Description of the embodiments

[0016] The invention consists of proposing a shared control architecture for regulating the electromechanical actuators of an aeronautical turbomachine.

[0017] To do this, the electromechanical actuation chain 10 for controlling the movement of aeronautical mobile loads 22 from a control unit 24, one or more of these mobile loads 22 (for example variable discharge doors or valves (VBV) or other variable geometries such as pumps) being actuated by an electromechanical actuator 30, comprises according to the invention a single Ethernet controller 32 ensuring via an Ethernet bus 34 the control of a set of converters 36 (the number of which is at most equal to the number of actuators) acting selectively on the electromechanical actuators 30. To enable the control of the mobile load 22, the controller 30 delivers a setpoint return (typically a position, in this case Pm, or a speed) to the control unit 24 which then returns a position (Pc) or speed command to it.This command uses a fast deterministic communication protocol to enable the control loops of each electromechanical actuator 30 to be managed in parallel. By deterministic, we mean that, for any information, we predict the precise duration that its transmission by the Ethernet controller will take.

[0018] The control loops are typically current i, speed V and position P loops. When the movement of the moving load is controlled in position (case of VBV doors illustrated), the main loop is the position loop, the speed and current loops then being considered as secondary loops. On the other hand, when the movement of the moving load is controlled in speed (case of pumps for example), the main loop is the speed loop, the position and current loops then being considered as secondary loops.

[0019] The deterministic Ethernet controller can be a dedicated component (for example integrating speed and current loops for vector modulation type regulation) or a microprocessor equipped with an Ethernet communication protocol.

[0020] The speed of transfer of information at the level of these two current and speed loops (in the case of position instruction) or current and position (in the case of speed instruction) that the Ethernet protocol allows is sufficiently fast (transfer time <15 µs and typically <10 µs) to be considered instantaneous at the level of the control loop (position or speed) whose transfer speed is at least a hundred times higher and advantageously around a thousand times higher (i.e. a transfer time of the order of 15 ms).

[0021] The converters 36 are, for example, single-phase choppers or three-phase inverters (or even hexaphase for redundancies at the actuator level) delivering an alternating voltage from a direct voltage (typically from a 270V DC Bus) and which, when they are identical in number to those of the actuators, are advantageously mechanically integrated within these actuators. When the moving load is a VBV gate, the actuator is integrated into each VBV gate (in the so-called "Booster" zone) and there are therefore as many actuators as there are VBV gates. This actuator is preferably a permanent magnet synchronous motor (however a variable reluctance motor, a stepper motor or an asynchronous motor is also possible) which can be coupled to a mechanical transmission, linear (of the roller or ball screw type for example) or rotary, integral with the load to be driven.

Claims

1. An electromechanical actuation chain for controlling the movement of mobile loads (22) of an aircraft turbine engine, from a control unit (24), one or more of said mobile loads being actuated by an electromechanical actuator (30), characterized in that, to control said movement, it also comprises a single Ethernet controller (32) having deterministic control that uses an Ethernet bus (34) to control a set of converters (36) acting selectively on said electromechanical actuators, the speed of information transfer allowed by the Ethernet protocol is sufficiently fast to be considered instantaneous in relation to the movement of the mobile load2. The electromechanical actuation chain according to claim 1, characterized in that said electromechanical actuator is a permanent magnet synchronous motor, an asynchronous motor, a variable reluctance motor or a stepped motor, whether or not coupled to linear or rotary mechanical transmission.

3. The electromechanical actuation chain according to claim 1 or claim 2, characterized in that said converter is a chopper or inverter.

4. The electromechanical actuation chain according to any of claims 1 to 3, characterized in that said deterministic Ethernet controller is configured to manage as many current, speed and position loops as there are electromechanical actuators.

5. The electromechanical actuation chain according to claim 4, characterized in that the speed of transfer of information at the current and speed loops, current and position loops respectively, is at least one hundred times faster than that of the position loop, speed loop respectively, driving movement of the mobile load.

6. The electromechanical actuation chain according to claim 5, characterized in that the speed of transfer of information at the current loops corresponds to a transfer time of less than 15 microseconds, typically 10 microseconds.

7. The electromechanical actuation chain according to claim 5, characterized in that the speed of transfer of information at the position or speed loop driving movement of the mobile load corresponds to a transfer time in the region of 15 milliseconds.

8. The electromechanical actuation chain according to any of claims 1 to 7 characterized in that said mobile loads are variable bleed valves the movement of which is driven by a position loop.

9. The electromechanical actuation chain according to any of claims 1 to 7, characterized in that said mobile loads are pumps the movement of which is driven by a speed loop.

10. An aircraft turbine engine comprising an electromechanical actuation chain according to any of claims 1 to 9.

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